Controlling device for locomotive superheaters



Dec. 28 1926.

M. J. FURLONG CONTRLLING DEVICE FOR LOCOMOTIVE SUPERHETERS Filed April 91924 3 Sheets-Sheet l Lw-Cox...

WITN ESS ES ATTCRNIY Dec. Z8 1926. 1,612,007

M. J. FuRLoNG CONTROLLING DEVICE FOR LOCOMOTIVE SUPERHEATERS Filed April9. 1924 3 Sheets-Sheet 22 x e v WITNESSES Dec. 28 1926.

M. J. FURLONG CONTROLLING DEVICE FOR LOCOMTIVE SUPERHEATERS I lNvaN-ron,

3 Sheets-Sheet 3 CIZU* ATTO RN EY Patented Der.. 28, 1926.

MARTN il'. FURLONG, OF EGUSEONQTEXAS.

CONTROLLING DEVCE'FOR LOCSMGTVE SUERHEATERS.

Application filed April 9, 1924. vSerial''-o. X/l.'

'lhis invention relates to acontrollingl device tor dainpers7 especiallyadapted to be used in connection with locoinotive superheaters, and isin the nature of an iinprovenient on the damper controlling devicedisclosed in S. Patent No. 1,454,161, issued to nie M av 8, 1923.

ln this et devices a damper plate' trolling the position ot the abovementioned damper, this ineans in its preferred torin being` actuated bysteam from the blower line.

Means are also provided whereby the blower line is automatically closedbetween the damper controlling ineans and the smoke stael7 through themedium of the exhaust troni the cylinders, whenever a predetei'- ininedspeed is attained.

The invention also coniprises various novel details ot construction andcombinations ot elements. the advantages of which 'will -be specilieallyexplain-ed in the following detailef description, which iste be read inconnection with the accompanying drawings illustratingthe preferred'torni of the inventien. 1

ln the drawings:

Figure 1 is a vertical lonftudinal section through the trent portion ota locomotive having niy invention installed therein! the dainper being`shown in full open position.

Figure-2 is a transverse"section taken on the line Q-Qot Figure 1.

Figure 3 is a det-ail view'ot a portionoif` the blower line showing`t-he darnper controlling moans and the oshast actuated valve torautomatically cor-.trolling` the ac-V tion of the blowerg the partsbeing shown in the `position whichithey occupy when the 1olor-.ierthrottle and the ste-ain throttle are shut ott.

Figure et illustrates tlie sanie*partsl after the blower throttle hasbeen opened Figure 5 illustrates the ,aine parts utter the steamthrottle has also been opened.4

Figure 6 is a detail view ot the blower piston valve atterit `has beenclosed bv the exhaust.` l

Figure 7 is a longitudinal sectional view of the blower throttle valvelocated `in the cab, the valve being- Vshown in open position'.

Figure 8 is a similar View showing-the valve closed.' l

The loeoinoti inconneetionrwith which my invention is used, ineludesaboiler shell 10, from the trent portion of which'jozrtends a smoke stack11. ln rear ot the sinelre `stack there. is a trai'isverse partitionplate v12, 70

and spaced 'seine distance in the tront'tube sheet-13, in -wliich areanchored the trout ends of the upper boiler tubes 14 and thelower-boiler tubes 15. 'She space between the trent tubesheet 13 and the75 transverse aartition platell, is divided by'a partition piatte 16into a superhea'ter box 11-- and a trent end chamber 18. Nithin the"superheaterchamber l? is located a supers` heater header 19 to whichareconnected` the 80 coil units 20, coiled in the respective tubes rllhetransverse partition plate 12 `is provided above the partition 16end introntotI the superheater with Aseries of transversely elongated draftoutlets 21, and beneath 4the 95 rear ot vthis is -partition plate 16,-isprovidedwith draft' outlets 22, siinilar to thefoutlets 21; but abouttwice as wide. A dainper plate 23 is inounted for vertical slidingvinove'inent adjacent thetransverse partition platelz5 and pro- 9i videdwith series et draitoutlets, all ot which. register with thecorresponding out-V lets 21 and 22 when thel damper-isili. 'full' openposition, as illustratedA in Figure 1. l/Jhen the damper is lowered "tointermediate 95 position, the outlets 21 are closed 'and' the drafttl'irough'the superheater is shut olf, but the'lower portions of theoutlets 22 are' stilll in registry with'the openings 2l: in the lowerpart of the damper. lWhen the dainper is lll dropped to its lowerniostposition, both lthe outlets 21 and are closed, and' all dra-tt shutoil".

The nieansftor operatingl the damper'l includes opposed pairs arins,whizh en- "tr" and support the damper, thesearnis being secured totransverse rock shafts 26, .and being connected in pairs by verticallinks 27. The rock shafts 26 are journaled in suitable bearings 28secured to the boiler shell 10, and are rocked by means of a crank arm29, which is secured to one of the rock shafts, where it extendsoutwardly beyond the boiler shell 10. The crank arm 29 is actuated torock the shafts 26 for moving the damper 23, through the medium of a pinand slot connection 30 with the upper end of a piston rod 31, whichcarries a small piston 32 at its lower end.

The small piston 32 is mounted for reciprocation in the cylindrical head33, of the damper piston valve 34. The cylindrical head 33 is connectedby a reduced stem portion 35 with a larger head 36. The damper pistonvalve 34 is housed within a casing 37, having a reduced portion 38 forreceiving the comparatively small upper head 33 of the valve. It will beobserved that the valve 34 may move between the upper and lower limitsof the casing 37, while the small piston may move between the upper andlower limits of the cylindrical head 33 of the valve, thus definingthree positions to which the. damper 23 may be moved. In order that thelimiting positions of the damper may be adjusted, it is preferred tosecure the housing 37 to the side of the boiler shell 10 by means ofbolt and slot connections 39, so that the same may be adjustedvertically.

In the absence of pressure within the valve casing'37, both the valve 34and the small piston 32 will drop by gravity to their lowermostpositions, as shown in Figure 3, and the damper 23 will also drop to itslowermost position shutting off all draft through both the superheaterchamber 17 and the front end chamber 18. In order to raise the damper,steam pressure is introduced first underneath the small piston 32,raising it to the position shown in Figure 4, where it engages the stops33a at the upper end of the cylinder head 33, and raising the damper 23to its intermediate position to create a draft through the front endchamber 18. lllhen pressure is also introduced underneath the valve head36, the latter is also raised and the parts occupy the position shown inFigure 5, and the damper is raised to its uppermost position, openingthe draft through the superheater 17, as well as through the front endchamber 13.

In the preferred form of the invention, the

valve chamber between the heads 33 and 36 casing44, and thence throughthe pipe 45, underneath the skirt 46 of the smoke stack 11. The smallpiston 32, when in its lowermost position is slightly spaced from thebottom of the cylinder 33 by stop lugs 4T, and the space beneath thepiston 32 is in conimunication with the space between the valve heads 33and 36 through ports 43. rllhe pipe 42 is preferably a little largerthan pipe 43, and as soon as the blower throttle is opened, pressurewill be created within the casing 37, and will enter through the ports43 underneath the piston raising it to the position shown in Figure 4,and raising the damper to intermediate position. T he downward pref-sureon the larger head 36 will still maintain the valve 34 in its lowermostposi-- tion.

rlhe locomotive throttle valve is connected by a pipe line 50 to thelower end of the valve casing 37, so that as soon as the throttle isopened, pressure is admitted underneath the head 36 to raise the latterand to open the draft through the superheater. 'lt is to be understoodthat the head 36 is slightly spaced from the bottom of the valve casingby means of lugs 49, so that the pressure reaches the entire area of thehead as soon as the throttle is opened.

An automatically actuated blower piston valve 51 is located within thecasing 44 between the damper valve casing 37 and the smoke stack 11 toshut off the blower line, while still leaving the draft damper raisedand the draft through the superheater open. The valve 51 has two heads52, which in the position shown in Figures 3, 4-and 5 are on oppositesides of the inlet pipe 43 and outlet pipe 45, so as to leave the blowerline open. Connected to the lower end of the valve 5l is a comparativelylarge piston head 53, enclosed within the enlarged extension 54 of thevalve casing 44, and slightly spaced from the lower end thereof by meansof stop lugs Leading from the lower end of the casing extension 54 is apipe 53, which terminates in an enlarged mouth 57, located within anextension 53 of the exhaust line 59 or otherwise connected to theexhaust line. lVhcnevcr the blower line is in operation therefore, andthe locomotive reaches a predetermined speed, a portion of the exhaustwill be trapped within the mouth 57, and will create sufficient pressureunderneath the piston head 53 to raise the latter to the position shownin Figures 6, interpcsing the lower head 52 of the valve between theinlet pipe 43 and outlet pipe 45, and shutting off the blower line whenit is no longer needed. This action, however, will not inateriallyretard the discharge of the exhaust around the sides of the mouth 57.

T he blower throttle valve casing 41, which is shown in Figures 7 and 8,is located within the cab and contains a double headed pislill) theblower line to partially open said damper and thereby permit a draftthrough the front end chamber, means for independently introducing`pressure underneath the piston valve to raise the same together with thepiston to complete the opening of the damper and thereby permit a draftthrough the superheater, and means connected with the exhaust line ofthe locomotive for automatical ly cuttingl olf the blower line betweenits outlet and the damper operated means when the locomotive attains apredetermined speed.

ln a locomotive, the combination of a superheater and a front endchamber located one above the other with their front walls in the sameplane, a damper therefor normally held closed and operating whenpartially open to permit a draft through the front end chamber andoperating when fully open to permit a draft also through thesuperheater, a blower line, means for introducing steam into the blowerline, a reciprocatory valve interposed in the blower line and having' acylinder head, a piston reciprocable in said head, means operable by themove'- nient of the piston to open said damper, said piston being`operable by pressure in the blower line to partially open the damper,and

means for introducingl pressure underneath the valve to raise the sametogether with said piston without interruption of the blower line, tocomplete the opening of said damper.

7. ln a locomotive, the combination of a superheater and a front endchamber located one above the other with their front walls in the sameplane, a vertically slidable damper therefor normally held closed by`gravity and operating when partially raised to permita draft throughthe front end chamber and operating when fully raised to also permit adraft through the superheater, a blower line, means for introducingsteam into the blower line, a reciprocable valve in terposed in theblower line and having a cylindrical head, a piston reciprocable in saidhead. means operable by the movement Iof the piston to open said damper,said piston being operable by pressure in the blower line to partiallyraise the damper, means for introducing,` pressure underneath the valveto raise the same together with said piston 'ithout interruption of theblower line, to complete the raisingof said damper, and means connectedwith the exhaust line of the locomotive and operable when thelocon'iotive attains a predetermined speed to cut olii the blower linebetween its youtlet and` said reciprocatory valve.

8. In a locomotive, the combination of a superheater and a front endchamber locat-` ed one above the other with their front walls in thesame plane, a damper therefor nor- 4mally held closed, a blowerline, alocomotive throttle line, a valve for introducing steam into the blowerline, means operating when pressure is admitted to the blower line foroperatingy the damper to permit a draft through the front end chamberand also operating when pressure is admitted to the locomotive throttleline to complete the openingof the damper and thereby to permita draftthrough the superheater, a piston valve interposed in the blower linebetween its outlet and the first mentioned valve, and a stem trap in theexhaust line of the locomotive and in communication with said pistonvalve and operable to close the same when the locomotive attains apredetermined speed.

9. In a locomotive, the combination of a superheater and a front endchamber located one above the vother with their front walls in the sameplane, a damper tl erefor normally held closed and operating when parl`tially raised to permit a draft through the front end chamber andoperatingl when fully raised to also permit a draft through thesuperheater, a blower line, a valve for intro ducing` steam into theblower line, a reciprocatory valve interposed in the blower line andhaving a cylindrical head, a piston operable in said head, meansoperable by the movement of the l iston to open said damper, said pistonbeing` raised within said valve head upon the introduction lof pressureinto the blower line, means for introducing` pressure uuderneah thevalve to raise the same together with said piston without interruptionof the blower line, to complete the raising of the damper, a piston vave interposed in the blower line between its outlet and thelirst-n'ientioned valve, and a steam trap in the exhaust line of thelocomotive and in communication with the piston valve and operable toclose the same when the locomotive attains a predetermined speed.

l0. In a locomotive, having a damper nor` mally held closed, thecombination of a reciprocatory piston, means operable by the movement ofthe piston to partially or fully open the damper, a reciprocatory piston'valve having a cylindrical head in which Said piston reciprocates, apressure line for introducing pressure underneath the piston head toraise the same within said head to partially open the damper while thevalve remains unmoved, and a second pressure line for introducing`pressure underneath the valve to raise the same together with the pistonto complete the opening of the damper.

1l; In a locomotive having a damper normally closed and movable topartially `open or fully open position, the combination of a compoundpiston valve and piston controllingl the position of the damper, apressure line associated with said valve and operating when underpressure to 'move the piston within the valve and partially open lili)the damper, und a second pressure line associsted with the valve andoperating when under pressure in conjunction with the pressure from theinst-mentioned line to reise the valve and pist-on together to coinpletethe opening of the damper.

l2. in n locomotive having a damper mounted for vertical reciprocationund normally held in its lowerrnost position by gravity, the combinationof a vertically reciproeuhle piston vulve having a cylindrical head, upiston vertically reciprocable in said heed, ineens connected with saidpiston for raising the damper, a pressure line associated with saidValve and operating when under pressure to raise the piston Within theValve and thereby raise the damper to intermediate position, and asecond pressure line associated with the vulve` and operating when underpressure in conjunction with the pressure of the rst mentioned line toraise the Valve together with Jthe piston and tl1ereby to complete theraising of the damper.

In testimony, thzrtI claim the foregoing as my own, l have heretoaffixed my signature. t

MARTIN J. FURLONG.

